html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden; /* Prevents scrollbars on the main page */
}

iframe {
    position: fixed; /* Positions the iframe relative to the viewport */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none; /* Removes default iframe border */
    margin: 0;
    padding: 0;
    overflow: hidden; /* Prevents scrollbars within the iframe itself if content exceeds its bounds */
    z-index: 9999; /* Ensures the iframe appears above other content if necessary */
}